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/** @file
Source file for the ActiveBios ActiveBios protocol implementation
@copyright
Copyright (c) 2005 - 2012 Intel Corporation. All rights reserved
This software and associated documentation (if any) is furnished
under a license and may only be used or copied in accordance
with the terms of the license. Except as permitted by such
license, no part of this software or documentation may be
reproduced, stored in a retrieval system, or transmitted in any
form or by any means without the express written consent of
Intel Corporation.
This file contains an 'Intel Peripheral Driver' and uniquely
identified as "Intel Reference Module" and is
licensed for Intel CPUs and chipsets under the terms of your
license agreement with Intel or your vendor. This file may
be modified by the user, subject to additional terms of the
license agreement
**/
#include "ActiveBios.h"
//
// Prototypes for our ActiveBios protocol functions
//
static
EFI_STATUS
EFIAPI
SetState (
IN EFI_ACTIVE_BIOS_PROTOCOL *This,
IN EFI_ACTIVE_BIOS_STATE DesiredState,
IN UINTN Key
);
static
EFI_STATUS
EFIAPI
LockState (
IN EFI_ACTIVE_BIOS_PROTOCOL *This,
IN BOOLEAN Lock,
IN OUT UINTN *Key
);
//
// Function implementations
//
/**
Change the current active BIOS settings to the requested state.
The caller is responsible for requesting a supported state from
the EFI_ACTIVE_BIOS_STATE selections.
This will fail if someone has locked the interface and the correct key is
not provided.
@param[in] This Pointer to the EFI_ACTIVE_BIOS_PROTOCOL instance.
@param[in] DesiredState The requested state to configure the system for.
@param[in] Key If the interface is locked, Key must be the Key
returned from the LockState function call.
@retval EFI_SUCCESS The function completed successfully
@retval EFI_ACCESS_DENIED The interface is currently locked.
**/
static
EFI_STATUS
EFIAPI
SetState (
IN EFI_ACTIVE_BIOS_PROTOCOL *This,
IN EFI_ACTIVE_BIOS_STATE DesiredState,
IN UINTN Key
)
{
PCH_SERIES PchSeries;
PchSeries = GetPchSeries();
///
/// Verify requested state is allowed
///
ASSERT (DesiredState < ActiveBiosStateMax);
///
/// Check if the interface is locked by another
///
if (mPrivateData.Locked && Key != mPrivateData.CurrentKey) {
return EFI_ACCESS_DENIED;
}
if ((MmioRead32 (mPchRootComplexBar + R_PCH_RCRB_GCS) & B_PCH_RCRB_GCS_BILD) == B_PCH_RCRB_GCS_BILD) {
return EFI_ACCESS_DENIED;
}
///
/// Set the requested state
///
switch (DesiredState) {
case ActiveBiosStateSpi:
if (PchSeries == PchH) {
MmioAndThenOr16 (
(UINTN) (mPchRootComplexBar + R_PCH_RCRB_GCS),
(UINT16) (~B_PCH_H_RCRB_GCS_BBS),
(UINT16) (V_PCH_H_RCRB_GCS_BBS_SPI)
);
}
if (PchSeries == PchLp) {
MmioAndThenOr16 (
(UINTN) (mPchRootComplexBar + R_PCH_RCRB_GCS),
(UINT16) (~B_PCH_LP_RCRB_GCS_BBS),
(UINT16) (V_PCH_LP_RCRB_GCS_BBS_SPI)
);
}
break;
case ActiveBiosStateLpc:
if (PchSeries == PchH) {
MmioAndThenOr16 (
(UINTN) (mPchRootComplexBar + R_PCH_RCRB_GCS),
(UINT16) (~B_PCH_H_RCRB_GCS_BBS),
(UINT16) (V_PCH_H_RCRB_GCS_BBS_LPC)
);
}
if (PchSeries == PchLp) {
MmioAndThenOr16 (
(UINTN) (mPchRootComplexBar + R_PCH_RCRB_GCS),
(UINT16) (~B_PCH_LP_RCRB_GCS_BBS),
(UINT16) (V_PCH_LP_RCRB_GCS_BBS_LPC)
);
}
break;
default:
///
/// This is an invalid use of the protocol
/// See definition, but caller must call with valid value
///
ASSERT (!EFI_UNSUPPORTED);
break;
}
///
/// Read state back
/// This ensures the chipset MMIO was flushed and updates the protocol state
///
MmioRead16 (mPchRootComplexBar + R_PCH_RCRB_GCS);
///
/// Record current state
///
mPrivateData.ActiveBiosProtocol.State = DesiredState;
return EFI_SUCCESS;
}
/**
Lock or unlock the current active BIOS state.
Key is a simple incrementing number.
@param[in] This Pointer to the EFI_ACTIVE_BIOS_PROTOCOL instance.
@param[in] Lock TRUE to lock the current state, FALSE to unlock.
@param[in, out] Key If Lock is TRUE, then a key will be returned. If
Lock is FALSE, the key returned from the prior call
to lock the protocol must be provided to unlock the
protocol. The value of Key is undefined except that
it cannot be 0.
@retval EFI_SUCCESS Command succeed.
@exception EFI_UNSUPPORTED The function is not supported.
@retval EFI_ACCESS_DENIED The interface is currently locked.
**/
static
EFI_STATUS
EFIAPI
LockState (
IN EFI_ACTIVE_BIOS_PROTOCOL *This,
IN BOOLEAN Lock,
IN OUT UINTN *Key
)
{
///
/// Check if lock or unlock requesed
///
if (Lock) {
///
/// Check if already locked
///
if (mPrivateData.Locked) {
return EFI_ACCESS_DENIED;
}
///
/// Lock the interface
///
mPrivateData.Locked = TRUE;
///
/// Increment the key
///
mPrivateData.CurrentKey++;
///
/// Update the caller's copy
///
*Key = mPrivateData.CurrentKey;
} else {
///
/// Verify caller "owns" the current lock
///
if (*Key == mPrivateData.CurrentKey) {
mPrivateData.Locked = FALSE;
} else {
return EFI_ACCESS_DENIED;
}
}
return EFI_SUCCESS;
}
/**
Initialization function for the ActiveBios protocol implementation.
@param[in] This Pointer to the protocol
@retval EFI_SUCCESS The function completed successfully
**/
EFI_STATUS
ActiveBiosProtocolConstructor (
IN EFI_ACTIVE_BIOS_PROTOCOL *This
)
{
EFI_STATUS Status;
EFI_HANDLE Handle;
EFI_GUID EfiActiveBiosProtocolGuid = EFI_ACTIVE_BIOS_PROTOCOL_GUID;
PCH_SERIES PchSeries;
PchSeries = GetPchSeries();
///
/// Read current state from the PCH
///
if (PchSeries == PchH) {
switch (MmioRead16 (mPchRootComplexBar + R_PCH_RCRB_GCS) & B_PCH_H_RCRB_GCS_BBS) {
case V_PCH_H_RCRB_GCS_BBS_SPI:
mPrivateData.ActiveBiosProtocol.State = ActiveBiosStateSpi;
break;
case V_PCH_H_RCRB_GCS_BBS_LPC:
mPrivateData.ActiveBiosProtocol.State = ActiveBiosStateLpc;
break;
default:
///
/// This is an invalid use of the protocol
/// See definition, but caller must call with valid value
///
ASSERT (!EFI_UNSUPPORTED);
break;
}
}
if (PchSeries == PchLp) {
switch (MmioRead16 (mPchRootComplexBar + R_PCH_RCRB_GCS) & B_PCH_LP_RCRB_GCS_BBS) {
case V_PCH_LP_RCRB_GCS_BBS_SPI:
mPrivateData.ActiveBiosProtocol.State = ActiveBiosStateSpi;
break;
case V_PCH_LP_RCRB_GCS_BBS_LPC:
mPrivateData.ActiveBiosProtocol.State = ActiveBiosStateLpc;
break;
default:
///
/// This is an invalid use of the protocol
/// See definition, but caller must call with valid value
///
ASSERT (!EFI_UNSUPPORTED);
break;
}
}
mPrivateData.ActiveBiosProtocol.SetState = SetState;
mPrivateData.ActiveBiosProtocol.LockState = LockState;
mPrivateData.CurrentKey = 1;
mPrivateData.Locked = FALSE;
///
/// Install the protocol
///
Handle = NULL;
Status = gBS->InstallMultipleProtocolInterfaces (
&Handle,
&EfiActiveBiosProtocolGuid,
&mPrivateData.ActiveBiosProtocol,
NULL
);
return Status;
}
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